Release of chlorine from the slow pyrolysis of NaCl-loaded cellulose at low temperatures
Release of chlorine from the slow pyrolysis of NaCl-loaded cellulose at low temperatures
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DOI：
10.1016/j.proci.2014.07.020
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发表时间：
2015
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影响因子：
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通讯作者：
M. U. Rahim;Xiangpeng Gao;Hongwei Wu
中科院分区：
文献类型：
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作者：
M. U. Rahim;Xiangpeng Gao;Hongwei Wu
本研究报告了负载氯化钠的纤维素在150-400 °C温度范围内缓慢热解过程中氯（Cl）的释放，为更好地了解生物质热解过程中低温Cl的释放提供了新的数据。结果表明，负载NaCl的纤维素在缓慢热解过程中释放的Cl的形式和量强烈依赖于热解温度。Cl在温度为300 °C时主要以HCl（g）的形式释放，而在温度为350 °C时则以有机结合在重焦油中的形式（称为“焦油-Cl”）释放。HCl（g）和总Cl（包括气态HCl和焦油-Cl）的释放在200 °C时开始，在350 °C时达到相应的最大值（气态HCl为53%，总Cl为71%），然后随着温度进一步升高至400 °C而趋于稳定。热解后固体残留物中有机结合的Cl的量也从150 °C下的106%增加到300 °C下的1036%，以固体残留物中Cl的%表示。进一步将温度升高至350-400 °C导致固体残留物中有机结合的Cl耗尽。我们的数据表明，氯和纤维素有机结构之间的相互作用是至少一个机制，负责在生物质热解过程中的HCl（g）和焦油氯的释放。
This study reports the chlorine (Cl) release during the slow pyrolysis of NaCl-loaded cellulose in the temperature range of 150–400 °C, providing new data to better understand the low-temperature Cl release during biomass pyrolysis. The results show that the form and amount of Cl released during the slow pyrolysis of the NaCl-loaded cellulose strongly depend on pyrolysis temperature. Cl is mainly released as HCl (g) at temperatures ⩽300 °C whereas it can be released in forms that are organically bound in heavy tar (termed as “tar-Cl”) at temperatures ⩾350 °C. The release of both HCl (g) and total Cl (including gaseous HCl and tar-Cl) begins at 200 °C, reaches the corresponding maximum values (∼53% for gaseous HCl and ∼71% for total Cl) at 350 °C, and then levels off with further increasing temperature to 400 °C. The amount of organically bound Cl in solid residues after pyrolysis also increases from ∼6% at 150 °C to ∼36% at 300 °C, expressed as % of Cl in the solid residues. Further increasing temperature to 350–400 °C leads to the depletion of the organically bound Cl in the solid residues. Our data show that the interaction between Cl and cellulose organic structure is at least one of the mechanisms responsible for the release of HCl (g) and tar-Cl during biomass pyrolysis.